Spark timing control system

摘要

A spark-timing control system is disclosed for an internal combustion engine having spark plugs and means adapted to cut off the supply of fuel to the engine under specified engine operating conditions including engine deceleration, low engine speed, and throttle idle position. The control system comprises a digital computer which performs the operational steps of: setting an optimum spark-timing value in terms of engine load; and providing an ignition signal to cause sparks at the spark plugs after a retard from the set optimum spark-timing value when engine acceleration occurs under a fuel cut-off condition.